Organizers of the 2012 Summer Olympics in London have promised the "greenest games" in history and sought to soothe concerns about the rising cost of the event.

With 2,012 days to go until the Games get under way, organizers said the design would champion low waste, low carbon emissions and environmentally friendly transportation. The Olympic Delivery Authority has promised to cut emissions 50 percent by generating energy on site and using renewable energy.

Prime Minister Tony Blair said London is farther ahead in preparations at this stage than any other previous Olympic host city.

The British government wants to have the Olympic budget finalized early this year, but costs have already risen substantially since London won the bid in July of 2005. A select committee report due Wednesday is expected to be highly critical of the government's financing of the Games.

Some information for this report was provided by AFP and  AP.